The fenix Chronos smart watch is a standout because it offers a ton of tech function and clean, understated styling. Quite a feat. The 49MM steel case features a high-strength, scratch-resistant sapphire lens and offers Elevate heart rate technology, for monitoring without a chest strap. Sensors include GPS and GLONASS satellite reception, barometric altimeter & 3-axis compass. It also gives you advanced fitness & running metrics plus text, email & alert notifications.